Heartland Dental is the nation's largest dental support organization, providing non-clinical administrative support services to more than 3,000 supported doctors across 39 states and the District of Columbia in over 1,900+ dental offices. Heartland Dental is the nation's largest dental support organization, providing non-clinical administrative support services to more than 3,000 supported doctors across 39 states and the District of Columbia in 1,900+ dental offices.